Improvement in head-stocks for milling-machines



anni suis- Ctuuu @tinta Letters Patent No. 111,311, dated January 31, 1871.l

IMPRCVEMENT IN HEAD-STOCKS FOR MILLING-MACHINES.

The Schedule referred to ixilthese Letters Patent and making pari: of the same.

I, AMos H. BRAINARD, of Hyde "Park, in the -county ofV Norfolk and State of Massachusetts, have Nature (tml Objects of the Invention.

The object of my invention. is to provide a headstock for milling and other machines for cutting straight and conical mills, bevel and spur-gears, and for milling at various angles, &c., for which purpose I construct it as follows:

On the drawing- Figure l is a side elevation Figure 2 is a transverse section',

Figure 3 is a longitudinal section ,and

Figure 4, a plan ot myinvention.

Similar letters indicate similar figures.

a a', are two upright standards rising from the base.

Between these standards is hung the block d, pivoted on the screws or turns to the extent oi' one hundred and twenty degrees, and is held in any required position by the screws f which move in the circular Islot e in the standard a.

Within the block d is fitted the spindle g, which is made slightly tapering to compensate for wear, and is held in its position by the check-nut h.

Within the spindle r/ is fitted a. tapering center, s, on the front end of which is supported one end of. an arbor or other work'to be held.

0n the block d is a line e which coincides with the lines .fo x .fc on the stam ard a', fig. 4, which plainly indicates the number of degrees of elevation or depression of' the block d, and consequently the correct 4position of the spindle g to a horizontal line.

On the front end of the spindle gis fitted Aan indexplate having its holes-in its periphery.

Into these holes enters the point lr, which holds the spindle inany required position. i

The spindle-is also provided with va Worm-wheel, i;

parts in all the bolts c c', on which it' working in this is the wornrl, which is supported by the bearings m m on the block d, and is turned by a crank, o.

By this means the index It is turned to any required position. y

, In the indexk are several lines of holes and the point r is made to enter either line bythe bar p, which carries the point r, being movable and held in any position by the screws q q.

Head-stocks now in use have the supporting-pins, screws, or bolts c c, of' the block d, near the left-hand edge of the standards (t a', and consequently give very small bearing surface on the block d when the spindle g is brought to nearly an upright or vertical position.

rlhis difficulty is entirely avoided in my invention by making the block d to hang by its center, thereby v giving the same amount of bearing surface in any position.

For milling circular or irregular work 011 cams, 86o., the head-stock is to be sot with the spindle g on the same line with the arbor of the mill used, and the pin c raised entirely out of the index k. The crankl is then used to turn the -spindle g andlwith it the arbor on which the cam or. other work is placed.

Forrcutting bevel-gears the block d may be placed in any position required.

Straight and conical 'mills may be cnt by elevating i or depressing the block d and using the index l.: and point fr to give Athe number of` teeth.

.Having thus described the '.natnre, construction, and uses ot' my invention, which I wish' to secure by Letters Patent, and claim- 1. The location of the pivot-pins o c for supporting the block d in the center of the standards a a', as and,

for the purpose described.

2. The combination of the worm-Wheel c', index-plate 7c, with the worm Z, adjustable index-arm p, and point 1', substantially as described. AMOS H. BRAINARD. Witnesses:

ALBAN ANDREW, FRANCIS GARDNER.

conical spindle g, the` 

